Design and Evaluation of Lattice Structures for Torsional Vibration Damping in Deep Hole Drilling Applications.

The increasing requirement to achieve high-quality bores in shorter process times and with longer tool lives calls for optimized manufacturing processes. Increased process parameters result in additional dynamic loads also on deep hole drilling tools, which mainly emerge as torsional vibrations. In this research paper, the design advantages of additively manufactured components are used to develop torsional vibration damping clamping sleeves for single-lip deep hole drills. Therefore, different lattice structures within the clamping sleeve are designed and examined regarding their damping properties, the impact on the torsional stiffness of the single-lip deep hole drill and the resulting frequency shift of the first torsional eigenfrequency compared to a clamping sleeve without damping structures. The probed structures include commonly known infill structures like honeycomb, triangles, and the grid lattice structure. Moreover, more complex lattice structures like lamella, spider web and diatom are designed and compared to a solid clamping sleeve probe.